*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.box{
    width: 1200px;
    height: 840px;
    position: absolute;
    margin-left: 250px;
    background-color: white;
}
.xm,.nl,.xq{
    height: 40px;
}
.son{
    margin-top: 20px;
}
.a1{
    background-color: rgb(0, 191, 255);
    margin-left: 5px;
    border-radius: 5px;
    font-size: 13px;
    width: 53px;
    height: 35px;
}
.a2{
    background-color: rgb(218, 165, 31);
    margin-left: 5px;
    border-radius: 5px;
    font-size: 13px;
    width: 120px;
    height: 35px;
}
table{
    border-spacing: 0px;
    border: 1px solid black;
    margin: auto;
    margin-top: 40px;
}
th,td{
    width: 2000px;
    height: 50px;
    text-align: center;
}
tbody tr:nth-of-type(odd){
    background-color: rgb(100, 149, 237);
}
tbody tr:nth-of-type(even){
    background-color: rgb(95, 158, 160);
}
tbody tr:hover{
    background-color: cornsilk;
}
